This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A113349 #5 Jun 13 2017 22:51:37 %S A113349 1,14,203,3367,64750,1435497,36312626,1036877170,33086963196, %T A113349 1169366274321,45412092740791,1924418011638535,88445828358934074, %U A113349 4384910640997110602,233384463606862044134,13278878088344760573344 %N A113349 Column 3 of triangle A113345, also equals column 0 of A113350^7. %C A113349 A113345 is the matrix square of A113340. %o A113349 (PARI) a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+4,B=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,B[i,j]=1,if(j==1, B[i,1]=1,B[i,j]=(A^(2*j-1))[i-j+1,1]));));A=B);(A^2)[n+4,4] %Y A113349 Cf. A113340, A113345, A113346 (column 0), A113347 (column 1), A113348 (column 2); A113350. %K A113349 nonn %O A113349 0,2 %A A113349 _Paul D. Hanna_, Nov 08 2005